Since naturalizing in central Texas, I have become obsessed with rain
– if we will get any, when we will get any, and, if so, how much we
will get. I have also developed a superstition about how to not
to screw up our chances for rain. It started with the simple and
annoying observation that, if the rain chances for a given day were in
the middle of the road, say 50% chance of thunderstorms, and my plants
needed to be watered, the chances for rain would plummet to about 5% the
minute that I decided not to water because rain was on the way.
So I learned, in my early years of Austin gardening, that if the soil
was dry and the rain chances were anything less than "flash flood
warning starting at noon today," I had better water. Because to be
prepared for no rain was the best way to encourage those middling chances of rain.
Using
the same logic, the best way to attract a rainy season to town is to be
prepared for weeks of heat and drought. Which means that my job in the
early summer, after the tomato, pepper, eggplant, and okra plants of my
hot-season garden have established, is to prepare the garden for the
onslaught of summer drought. Because to be prepared for early, baking
heat is the best way to bring thunderstorms to May and June, which can
be the rainiest months of the year here in Austin, where a "rainy
season" can happen at any time of year, for any number of weeks, or can
just as easily disappear, at any time, for any number of months.
I
prepare for drought by mulching, or covering the garden soil with a
thick layer of leaves, stems, or wood chips. I look forward to mulching
day through March and April, during the seed planting, transplanting,
daily watering, and weeding, because mulching day is like graduation day
for my plants. After mulching I still love them and care for them, but
my role is changed. If the rains don't come, I water twice a week, in the dark of the night, by
turning on a soaker hose and disappearing into the climate-controlled
house while a timer runs. If the rains do come, then I am really not
needed in the garden except to harvest fruits, which my plants make all
on their own, in the bright light of Texas summer. So I love the
tucked-in and
ready-to-take-care-of-itself look that the garden has just after it has
been mulched.
The mulching material that I use varies
depending on the season, the type of garden bed, and what I have on
hand. For establishing new garden beds, which requires a deep mat of
heavy mulch to kill the weeds and limit the unkillable Bermuda grass, so
that its greenery is reduced and its roots are easily dig-out-able, I
use lawn clippings. Lawn clippings are ugly and moldy, but,
over time, as the layers pile on, they make an effective barrier against
weeds that eventually breaks down into compost, improving the future
garden soil. More importantly, the depth and thickness of a mat of lawn
clippings ensures that the soil beneath is heavily insulated from the
heat and dry of the air above, creating a moist, cozy environment for
the bacteria, fungi, and insects of the soil, who in turn are the real
creators of that future garden soil.
On my garden
pathways and around my perennials, I use cedar mulch. It's inexpensive
and attractive, and I like the smell. As a big fan of trees being left
standing, I do worry about using wood mulches, but as far as I can tell,
the cedar mulch made by Austin Wood Recycling
is made by shredding cedar (Juniperus ashei) trees that are
cleared from overgrown land. Given that cedar trees are abundant to the
point of being invasive in central Texas, I don't
mind the idea of those trees being torn down and shredded for mulch,
though I do wish they were being torn down to make room for a native
grassland instead of a housing development. In any case, cedar mulch
keeps my front-yard garden looking neat around the edges and it is
long-lasting. The only downside to cedar mulch is that it is as
attractive to the neighborhood cats as it is to me. Apparently, if
you're a cat, wild or allowed to roam, to whom my street is home, then my garden is the place to shit. When I lost a
couple of baby plants to an over-exuberant feline digger this spring, I
began to reconsider: maybe it's time to switch to gravel mulch for the
perennial beds.
In the winter, or when I have them, I
use fallen leaves. My backyard produces a good pile of leaves every
December, a mix of post oak, cedar elm, and hackberry. Still, I always
think that I could use a lot more leaves, because of which I have a
mental map of whose lawns along my usual driving routes have the best
mix of leaves and often find myself, around the end of the year,
wondering about the contents of other people's yard-waste bags. I pile
the raked leaves around my fall greens, just after they've passed the
baby greens stage, or around the broccoli-family transplants after they
have established. I usually save the last raking of the season, the
January (or, this year, February) leaf pile, to be used at the end of
the hot season, to be the mulch-on-top-of-the-mulch that puts the garden
to bed for the hottest months of the year.
My
favorite mulch, the mulch that I use for my hot-season vegetable
garden, is alfalfa hay. Alfalfa isn't technically a hay, because
alfalfa itself is not a grass but a broad-leafed plant in the Pea
Family, but, because it comes in heavy bales and is called "hay" by
horse people, I think of it as alfalfa hay. But the fact that it is not
hay is actually quite important to my garden. The first hay that I
tried to use as mulch for my community garden plot, in my first
summer as a Texas gardener, was grass hay. Where I grew up, in western
Oregon, grass hay was common stuff, so I was surprised when nobody in
Austin had heard of grass hay. Instead, I was directed to something
called "coastal hay," which seemed to be the Texas equivalent of grass
hay. I found the coastal hay to be expensive and crappy compared to the
grass hay that I had known, but I put it on my garden anyway. My
plants didn't die that year, but they didn't thrive either, and it took
the soil a couple of seasons to get back to what it had been.
During
which time I learned a couple of things about hay. First, it turns out
that the Willamette Valley of Oregon is the world center of grass seed
production. Long, rainy, mild springs produce the best grass hay in the
world with minimal chemical input. So my views on hay quality and
availability are heavily skewed by memories of hauling in bales of hay
from the neighbor's field in June and feeding fine-stemmed,
sweet-smelling flakes of grass hay to the horses all winter. Second,
and more importantly, Texas coastal hay is heavily sprayed with broad-leafed
herbicides, which are poisonous to garden plants. The moral of the
story is that coastal hay is poison for your garden.
Once
I was aware of the perils of using true hay in Texas, I switched to
alfalfa, which worked so well that it has become a yearly ritual to go
to the farm supply store to buy a couple of bales. At the end of April,
once the okra has been thinned, and the beds have been weeded one final
time, and the soaker hoses are in place, I tear apart flakes of alfalfa
and stuff handfuls of the scratchy stems between my plants, creating a
thick, unbroken layer of mulch. If I am lucky, thunderstorms follow
mulching day, and the heavy rains seal the alfalfa into place like a
heavy, woven crust over the garden. Alfalfa mulch stays in place,
through rain or shine, better than any other mulch I have used, and for
that alone it is a great mulching material. But that is just the
beginning of its utility. Alfalfa is also perfect for my hot-season
garden in that it lasts all season but, after several months on the
soil, breaks down just as readily. In fact, I have found that if I
cover the alfalfa with a layer of leaves as I remove the spent garden plants in
August, in effect mulching the mulch, then, when the fall rains come, the
alfalfa beneath the leaf mulch will compost quickly, largely
disappearing into the soil by the time of fall planting.
When alfalfa breaks down into the soil, it feeds the soil. This is true of all mulches – except for gravel mulch, of course, unless you think in geologic time – they eventually break down and add organic matter and nutrition to the soil. But, while shredded wood can actually rob the soil, temporarily, of nutrients, and dead leaves add mainly micronutrients and humic acid to the soil, alfalfa is high in nitrogen, which is a primary soil nutrient needed by plants. In fact, "alfalfa meal" is often one of the first ingredients in organic fertilizers, providing the nitrogen part of the N-P-K kick. And that is the real reason, aside from the satisfaction of heaving a bale of hay, that I love to use alfalfa to mulch my summer garden. Every time I buy a bale of alfalfa, I feel clever knowing that this year's mulch is also next year's fertilizer.
Here is the final secret about mulching that
the rain gods don't need to know: To mulch is also to prepare the
garden for a rainy summer. Just as a thick layer of mulch protects the
soil from evaporation, it also protects the soil from flooding. In the
midst of a downpour, water reaches the garden bed more gently, only
after flowing around and through the many layers of leaves and stems
that make up the mulch, so the soil beneath is much less likely to be
carried away. Plus, mulch reduces splashing, so that the undersides of
the leaves of my eggplant, tomato, pepper, okra, and basil plants don't
get coated in mud during a storm. Because of this, the plants are less
prone to the fungal diseases that ride around in mud splashes, and they
stay cleaner.
So every season I mulch, in preparation for heat and drought, but also in hopes of a rainy season. I mulch to protect the soil this season, to improve the soil next season, and to feed the soil the season after next. I mulch because no other garden practice is so cheap and easy, with so many benefits to the soil. The soil that is the basis of this entire operation.
Excellent!! Thank you!!!
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